BURLINGTON - "Sleep it," Judith Schulz ordered. With those words, three silver-colored yo-yos dropped to the end of their strings and hung there, stalled but still spinning. The three boys holding the ...
Even the most basic yo-yo tricks depend on the toy’s ability to keep on spinning. But why does it spin so fast for so long? The magic center of a yo-yo is a bearing—a bunch of tiny metal balls trapped ...
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